linux-kernel - [PATCH v3,01/21] v4l2: add secure memory flags

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Message-ID: <20231206081538.17056-2-yunfei.dong@mediatek.com>
Date:   Wed, 6 Dec 2023 16:15:18 +0800
From:   Yunfei Dong <yunfei.dong@...iatek.com>
To:     Jeffrey Kardatzke <jkardatzke@...gle.com>,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Nathan Hebert <nhebert@...omium.org>
CC:     Chen-Yu Tsai <wenst@...omium.org>, Yong Wu <yong.wu@...iatek.com>,
        "Hsin-Yi Wang" <hsinyi@...omium.org>,
        Fritz Koenig <frkoenig@...omium.org>,
        "Daniel Vetter" <daniel@...ll.ch>,
        Steve Cho <stevecho@...omium.org>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        "Brian Starkey" <Brian.Starkey@....com>,
        John Stultz <jstultz@...gle.com>,
        "T . J . Mercier" <tjmercier@...gle.com>,
        Christian König <christian.koenig@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linaro-mm-sig@...ts.linaro.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: [PATCH v3,01/21] v4l2: add secure memory flags

From: Jeffrey Kardatzke <jkardatzke@...gle.com>

Adds a V4L2 flag which indicates that a queue is using secure dmabufs
and the corresponding capability flag.

Signed-off-by: Jeffrey Kardatzke <jkardatzke@...gle.com>
Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
---
 include/media/videobuf2-core.h | 8 +++++++-
 include/uapi/linux/videodev2.h | 2 ++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 5557d78b6f20..98eba43661c1 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -518,6 +518,9 @@ struct vb2_buf_ops {
  *		->finish().
  * @non_coherent_mem: when set queue will attempt to allocate buffers using
  *		non-coherent memory.
+ * @allow_secure_mem: when set user-space can pass the %V4L2_MEMORY_FLAG_SECURE
+ *		flag to indicate the dma bufs are secure.
+ * @secure_mem: when set queue will verify that the dma bufs are secure.
  * @lock:	pointer to a mutex that protects the &struct vb2_queue. The
  *		driver can set this to a mutex to let the v4l2 core serialize
  *		the queuing ioctls. If the driver wants to handle locking
@@ -601,6 +604,8 @@ struct vb2_queue {
 	unsigned int			uses_requests:1;
 	unsigned int			allow_cache_hints:1;
 	unsigned int			non_coherent_mem:1;
+	unsigned int			allow_secure_mem:1;
+	unsigned int			secure_mem:1;
 
 	struct mutex			*lock;
 	void				*owner;
@@ -770,7 +775,8 @@ void vb2_core_querybuf(struct vb2_queue *q, struct vb2_buffer *vb, void *pb);
  * @q:		pointer to &struct vb2_queue with videobuf2 queue.
  * @memory:	memory type, as defined by &enum vb2_memory.
  * @flags:	auxiliary queue/buffer management flags. Currently, the only
- *		used flag is %V4L2_MEMORY_FLAG_NON_COHERENT.
+ *		used flags are %V4L2_MEMORY_FLAG_NON_COHERENT and
+ *		%V4L2_MEMORY_FLAG_SECURE.
  * @count:	requested buffer count.
  *
  * Videobuf2 core helper to implement VIDIOC_REQBUF() operation. It is called
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 68e7ac178cc2..570b11552818 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -1026,6 +1026,7 @@ struct v4l2_requestbuffers {
 };
 
 #define V4L2_MEMORY_FLAG_NON_COHERENT			(1 << 0)
+#define V4L2_MEMORY_FLAG_SECURE				(1 << 1)
 
 /* capabilities for struct v4l2_requestbuffers and v4l2_create_buffers */
 #define V4L2_BUF_CAP_SUPPORTS_MMAP			(1 << 0)
@@ -1036,6 +1037,7 @@ struct v4l2_requestbuffers {
 #define V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF	(1 << 5)
 #define V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS		(1 << 6)
 #define V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS		(1 << 7)
+#define V4L2_BUF_CAP_SUPPORTS_SECURE_MEM		(1 << 8)
 
 /**
  * struct v4l2_plane - plane info for multi-planar buffers
-- 
2.18.0